Coherent quantum switch driven by optimized laser pulses

E. Räsänen*, A. Castro, J. Werschnik, A. Rubio, E. K.U. Gross

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We present two models of coherent quantum switches constructed from a single-electron quantum ring and a double quantum dot, respectively. The systems are driven by picosecond laser pulses obtained using quantum optimal control theory. The optimized pulses generate electron-current flips in the ring (magnetic switch) and electron transport in the double dot (charge switch) in significantly shorter times and higher accuracies than previously used finite-length continuous waves. This opens applicable paths into coherent single-qubit gates operated by terahertz lasers.

Original languageAmerican English
Pages (from-to)1593-1595
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume40
Issue number5
DOIs
StatePublished - Mar 2008
Externally publishedYes

Keywords

  • Double quantum dot
  • Optimal control theory
  • Quantum ring
  • Qubit

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